private static async Task HandleCommandException(CancellationToken ct, IDynamicCommand command, Exception exception, IServiceProvider services)
{
if (exception?.IsOrContainsExceptionType <OperationCanceledException>() ?? false)
{
return;
}
var messageDialogService = services.GetRequiredService <IMessageDialogService>();
var stringLocalizer = services.GetRequiredService <IStringLocalizer>();
var titleResourceKey = string.Empty;
var bodyResourceKey = string.Empty;
if (exception.IsOrContainsExceptionType <NoNetworkException>())
{
titleResourceKey = $"NoNetwork_Error_DialogTitle";
bodyResourceKey = $"NoNetwork_Error_DialogBody";
}
else
{
titleResourceKey = $"{command.Name}_Error_DialogTitle";
bodyResourceKey = $"{command.Name}_Error_DialogBody";
}
var title = stringLocalizer[titleResourceKey];
var body = stringLocalizer[bodyResourceKey];
title = title.ResourceNotFound ? stringLocalizer["Default_Error_DialogTitle"] : title;
body = body.ResourceNotFound ? stringLocalizer["Default_Error_DialogBody"] : body;
await messageDialogService.ShowMessage(ct, m => m
.Title(title)
.Content(body)
);
}
/// <summary>
/// Initializes a new instance of the <see cref="DynamicCommandDataLoaderTrigger"/> class.
/// </summary>
/// <param name="command">The dynamic command causing the triggers.</param>
/// <param name="triggerOptions">The trigger options.</param>
public DynamicCommandDataLoaderTrigger(IDynamicCommand command, CommandTriggerOptions triggerOptions)
: base(command?.Name)
{
_command = command ?? throw new ArgumentNullException(nameof(command));
_triggerOptions = triggerOptions;
_command.IsExecutingChanged += OnIsExecutingChanged;
}
/// <summary>
/// Observes if the <see cref="IDynamicCommand"/> is currently executing.
/// </summary>
/// <param name="command"><see cref="IDynamicCommand"/></param>
/// <returns>Observable of boolean</returns>
public static IObservable <bool> ObserveIsExecuting(this IDynamicCommand command)
{
return(Observable.FromEventPattern <EventHandler, EventArgs>(
h => command.IsExecutingChanged += h,
h => command.IsExecutingChanged -= h
)
.Select(p => command.IsExecuting));
}
/// <inheritdoc/>
public override async Task Execute(CancellationToken ct, object parameter, IDynamicCommand command)
{
try
{
await base.Execute(ct, parameter, command);
}
catch (Exception e)
{
await _errorHandler.HandleError(ct, command, e);
}
}
/// <inheritdoc />
public override async Task Execute(CancellationToken ct, object parameter, IDynamicCommand command)
{
TryCancelExecution();
_cancellationTokenSource = new CancellationTokenSource();
using (ct.Register(TryCancelExecution))
{
await base.Execute(_cancellationTokenSource.Token, parameter, command);
}
}
/// <inheritdoc />
public override async Task Execute(CancellationToken ct, object parameter, IDynamicCommand command)
{
try
{
await _semaphore.WaitAsync(ct);
await base.Execute(ct, parameter, command);
}
finally
{
_semaphore.Release();
}
}
/// <inheritdoc/>
public IDynamicCommand Build()
{
if (_command != null)
{
throw new InvalidOperationException("This builder already built a command. A DynamicCommandBuilder can only build a single command because strategy instances cannot be shared.");
}
var strategy = GetStrategy(BaseStrategy, Strategies);
_command = new DynamicCommand(Name, strategy);
return(_command);
}
/// <inheritdoc />
public override async Task Execute(CancellationToken ct, object parameter, IDynamicCommand command)
{
if (Interlocked.CompareExchange(ref _isExecuting, 1, 0) == 0)
{
try
{
await base.Execute(ct, parameter, command);
}
finally
{
_isExecuting = 0;
}
}
}
/// <inheritdoc />
public override async Task Execute(CancellationToken ct, object parameter, IDynamicCommand command)
{
try
{
_logger.LogDebug($"Executing command '{command.Name}'.");
await base.Execute(ct, parameter, command);
_logger.LogInformation($"Executed command '{command.Name}'.");
}
catch (Exception e)
{
_logger.LogError(e, $"Failed to execute command '{command.Name}'.");
throw;
}
}
/// <summary>
/// Executes the specified <see cref="IDynamicCommand"/> without a parameter.
/// </summary>
/// <param name="command"><see cref="IDynamicCommand"/></param>
/// <returns><see cref="Task"/></returns>
public static Task Execute(this IDynamicCommand command)
{
return(command.Execute(null));
}
/// <summary>
/// Adds a <see cref="IDynamicCommand"/> trigger.
/// </summary>
/// <remarks>
/// The name of the trigger is the name of the <paramref name="command"/>.
/// </remarks>
/// <typeparam name="TBuilder">The type of builder.</typeparam>
/// <param name="dataLoaderBuilder">This builder.</param>
/// <param name="command">The dynamic command causing the triggers.</param>
/// <param name="triggerExecution">The trigger options.</param>
/// <returns><see cref="IDataLoaderBuilder"/></returns>
public static TBuilder TriggerOnCommandExecution <TBuilder>(
this TBuilder dataLoaderBuilder,
IDynamicCommand command,
CommandTriggerOptions triggerExecution = CommandTriggerOptions.TriggerBeforeCommandExecution)
where TBuilder : IDataLoaderBuilder
=> dataLoaderBuilder.WithTrigger(new DynamicCommandDataLoaderTrigger(command, triggerExecution));
/// <inheritdoc />
public override Task Execute(CancellationToken ct, object parameter, IDynamicCommand command)
{
return(Task.Run(() => base.Execute(ct, parameter, command)));
}
/// <inheritdoc /> public Task Execute(CancellationToken ct, object parameter, IDynamicCommand command) => _execute(ct, parameter);
/// <inheritdoc/> public Task HandleError(CancellationToken ct, IDynamicCommand command, Exception exception) => _handlerFunction.Invoke(ct, command, exception);
/// <inheritdoc /> public bool CanExecute(object parameter, IDynamicCommand command) => true;
public bool CanExecute(object parameter, IDynamicCommand command) => _onCanExecute != null
? _onCanExecute.Invoke(parameter, command)
: true;
public override Task Execute(CancellationToken ct, object parameter, IDynamicCommand command)
{
_testAction();
return(base.Execute(ct, parameter, command));
}
public Task Execute(CancellationToken ct, object parameter, IDynamicCommand command) => _onExecute != null
? _onExecute.Invoke(ct, parameter, command)
: Task.CompletedTask;
/// <summary>
/// Gets and observes if the <see cref="IDynamicCommand"/> is currently executing.
/// </summary>
/// <param name="command"><see cref="IDynamicCommand"/></param>
/// <returns>Observable of boolean</returns>
public static IObservable <bool> GetAndObserveIsExecuting(this IDynamicCommand command)
{
return(ObserveIsExecuting(command).StartWith(command.IsExecuting));
}
/// <inheritdoc />
public Task Execute(CancellationToken ct, object parameter, IDynamicCommand command)
{
_execute(parameter);
return(Task.CompletedTask);
}